What is Flushing in RocksDB?

Flushing is the process of writing a full, immutable MemTable's contents out to disk as a new SSTable.

• Triggered once the active MemTable reaches its configured size limit
• The full MemTable is marked immutable, and a new, empty MemTable takes over for future writes
• A background thread performs the actual write to disk, so it doesn't block new writes from continuing to arrive

This is the step that moves data from RocksDB's fast, memory-resident write path into its durable, disk-resident storage as a Level-0 SSTable.

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